Array object method reference _ basic knowledge

For the Array object method, refer to the concat method: return a new Array, which is composed of two or more arrays. Array1.concat ([item1 [, item2 [,... [, itemN])

Join method: returns the string value, which contains all elements of the connected array. The elements are separated by the specified separator. ArrayObj. join (separator)

Pop method: remove the last element from the array and return the element. ArrayObj. pop ()

Push method: add new elements to an array and return the new Length Value of the array. ArrayObj. push ([item1 [item2 [... [itemN])

Reverse Method: returns an Array object whose element order is reversed. ArrayObj. reverse ()

Shift: removes the first element from the array and returns the element. ArrayObj. shift ()

Slice Method: return a segment of an array. ArrayObj. slice (start, [end])

Sort method: returns an Array object whose elements have been sorted. Arrayobj. sort (sortfunction)

Splice method: removes one or more elements from an array. If necessary, insert a new element at the position of the removed element to return the removed element. ArrayObj. splice (start, deleteCount, [item1 [, item2 [,... [, itemN])

Unshift: insert the specified element into the starting position of the array and return the array. ArrayObj. unshift ([item1 [, item2 [,... [, itemN])